7
Motion Commands
7.2.3
Zero Point Return (ZRET)
7-22
[ b ] ZERO Signal Method (OW
3C = 1)
z
Operation after Zero Point Return Starts
Travel is started at the approach speed in the direction specified in the parameters.
When the rising edge of the ZERO signal is detected, the speed is reduced to the creep speed and
positioning is performed.
When the positioning has been completed, a machine coordinate system is established with the final
position as the zero point.
The moving amount after the ZERO signal is detected is set in the Home Offset (OL
42).
If an OT signal is detected during the zero point return operation, an OT alarm will occur.
* 1. The SERVOPACK EXT1 signal.
* 2. The SERVOPACK P-OT signal.
* 3. The SERVOPACK N-OT signal.
z
Setting Parameters
NOT
∗3
POT
∗2
Start
Zero Point
ZERO signal
∗1
Home Offset
(OL42)
Creep Speed
(OL40)
Approach Speed
(OL3E)
Parameter Name Setting
OW
3C
Home Return Type
1: ZERO Signal Method
OB
093
Home Direction
Set the zero point return direction.
OL
3E
Approach Speed
Set the speed to use when starting a zero point return.
Only a positive value can be set; a negative value will result in an error.
OL
40
Creep Speed
Set the speed to use after detecting the ZERO signal.
Only a positive value can be set; a negative value will result in an error.
OL
42
Home Offset
Set the travel distance from the point where the ZERO signal is detected.
If the sign is positive, travel will be toward the zero point return direction; if
the sign is negative, travel will be away from the zero point return direction.
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